Angiotensin-II will perform all the following except

Options

A. Vasoconstriction
B. Hypernatremia
C. Increasing GFR
D. Excretion of `Na^(+)` in urine

Answer

To solve the question regarding the functions of Angiotensin-II, we will analyze each option provided and determine which one is not performed by Angiotensin-II.

### Step-by-Step Solution:

1. **Understanding Angiotensin-II**:
- Angiotensin-II is a hormone that plays a crucial role in regulating blood pressure and fluid balance. It is formed from Angiotensin-I by the action of the Angiotensin Converting Enzyme (ACE).

2. **Analyzing the Options**:
- **Option 1**: Vasoconstriction (Constricts blood vessels and increases blood pressure).
- Angiotensin-II is known to cause vasoconstriction, which increases blood pressure. This option is performed by Angiotensin-II.

- **Option 2**: Hypernatremia (Increased sodium levels in the blood).
- Hypernatremia occurs due to a lack of water intake or excessive sodium intake. Angiotensin-II does not cause hypernatremia; instead, it promotes thirst and water retention. Therefore, this option is likely the correct answer as it is not performed by Angiotensin-II.

- **Option 3**: Increasing Glomerular Filtration Rate (GFR).
- Angiotensin-II can affect GFR, but it generally causes constriction of the efferent arterioles in the kidneys, which can lead to an increase in GFR under certain conditions. Thus, this option is performed by Angiotensin-II.

- **Option 4**: Excretion of sodium ions in urine.
- Angiotensin-II promotes sodium reabsorption in the proximal convoluted tubule of the kidneys, which means it would reduce sodium excretion. This option is also performed by Angiotensin-II.

3. **Conclusion**:
- The only option that is not performed by Angiotensin-II is **Option 2: Hypernatremia**.

### Final Answer:
Angiotensin-II will perform all the following except **Hypernatremia**.